Rotary mixing-machine.



J. S. GWENS. ROTARY MIXING MACHINE.

APPLICATION FILED JAIL31, 1911.

1,093,723. v Patented m21, 1914 fava/afar.

UNiTED sTATEs PATENT oEEioE.

JOHN SWITZER OWENS, yOil LONDON, ENGLAND, ASSIGNOR 10 JOHN MALAN DEMENDOZA VEB. MEHR, OF LONDON, ENGLAND. i

ROTARY MIXING-MACHINE.

Specification of Letters Patent.

Application led January 31, 1911.

Patented Apr. 21, 1914.

Serial No. 605,772.

siding at London, in the county of Middle' sexfEngland, have inventednew and useful Improvements in RotaryMixing-Machines,

of'which the following is a specification.

This invention has reference to rotary mixing machines of that kind inwhich the materials to be mixed are introduced into a revoluble mixingdrum provided with a plurality of mixing blades or baliies some of whichare so arranged as to form lifting pockets adapted as the drum isrotated to carry the materials up and deliver them into a dischargechute introduced through an aperture at one side ofthe drum.

Mixers of this type are commonly employed for producing concrete mortarand like mixtures for building and constructional purposes theingredients being placed in the mixer a batch or charge at a time and inlike manner discharged when mixed and it is to devices for this purposeto which my invention is particularly applicable although it is to beunderstood that the improvements hereinafter described are not confinedto mixers for this purpose as they may be advantageously applied torotary mixing machines employed for producing an intimate mixing orcommingling of other materials or ingredients. Various means have fromtime to time been proposed in mixers of this type whereby the charge orvbatch shall be centralized within the drum and various forms of liftingpockets and mixing blades have been suggested. ln actual practice vhowever such a construction has been found to possess many disadvantagesthe hief of which is that owing to the absence of ways for the freepassage of the more liquid parts of the mixture accumulation Within theshall be more rapidly and thoroughly interassociated parts.

mingled while at the same time reducing to a minimum outward splashingof the. materials and to render the drum largely selfcleaning.

With these ends in view my invention broadly considered may be said tocontemplate a construction in which the liftingr pockets are arranged inthe diametric central plane of the drum and in which relatively shortnon continuous mixing blades are symmetrically arranged upon both sidesof said diametric-central plane of the drum all in such a manner that asthe drum revolves the materials to be mixed shall be caused to move inplanes passing through its axis of rotation and also in planes normal toits axis of rotation.

In order that my invention may be readily understood and carried intoeffect by those tion of the parts located therein. Fig. 2 is a verticalsection of a complete drum and its Fig. 3 illustrates the arrangement ofthe mixing blades and lifting pockets as they would appear on theinterior annular surface of the drinn if such surface were spread openupon a plane, and 4 is a detail view of one of the lifting pocketshereinafter described.

Referring now to Figs. 1 and 2 the drum is composed of an imperforateannular wall a and end wallsb b one of which is provided with a centralfeed aperture c and the other with a central'chute receiving apertureo".Said drum is provided with annular tracks d d on one of which is a geare adapted to mesh with. a gear wheel f mounted upon the frame of themachine and driven in any suitable manner and carrying rollers g arealso mounted upon the frame to support the drum. Ihe chute g serving forthedischarge of-the mixed material is pivotally mounted upon appropriatesupports in such a manner that it may be introduced into or removed fromthe discharge opening c in the end wallb as will be well understood bythose skilled in the art. The construction so far described is common torotary mixers and therefore forms no part of the present invention whichresides solely in the arrangement of the mixing blades and liftingpockets secured to the interior annular surface of the drum and which Iwill now proceed to describe.

The interior annular wall a is provided with a series of lifting pocketsh arranged along a central line 2 2 (Fig. 3) the mouths z' of saidpockets being directed slightly toward the chute receiving aperture cVso that as the drum revolves said lifting pockets will travel around theinwardly projecting end of the discharge chute g when this latter is inposition to carry the mixed materials upwardly and drop it into thechute and in order to further facilitate such discharge of the mixtureinto the chute the said lifting pockets are formed with one side or wallhigher than the other side or wall as will be seen by referring to Fig.4. This is an important feature of my invention as it will be seen thatas the drum revolves and the pockets successively occupy theirhighest-position the higher wall of the pockets which `is situated onthe side opposite the discharge aperture of the drum will act to directvthe mixture more certainly into the` discharge chute when-this latter isin the discharge position. Mounted edgewise upon the said annular wall aof the drum and between the lifting pockets l1. is a series of mixingblades j arranged in angular relation to the central line 2 2 of thedrum and disposed preferably in pairs each pair being arranged instaggered relation to the pair immediately preceding so as to formpassage ways as indicated by the arrows in Fig. 3-through which the morefluid parts of the mixture pass whereby the softer portions of theconcrete lodgments are to a great extent washed out rendering the drumlargely self-cleaning.

It will be seen that by my iynproifcd construction as the drum isrotated the matcrials to be mixed will be constantly in nio tion in two;directions being first caused by bythe mixing blades j to move from bothperipheral edges of the drum toward the center then being lifted by thepockets and discharged to the bottom from the lifting pocket situatedfor the time being at the lop of the drum. By this means a constant andmore 4thorough overlapping of the ingredients will be obtainedapproximately in the diametriccenter plane of the drum a feature ofconsiderable importance for in the case of a concrete mixture of sandcement and ballast for example the tendency of the various ingredientsis to separate or settle whereas by causing them to be thrown togethersimultaneously in directions more .or less at right angles to each otherand approximately in a central dia'metric plane a thorough and rapidintermixing of the various ingredients is effected.

What I claim and desire to secure by Lc'rters Patent of the UnitedStates of Amer-

